Strobel’s shallow fill softsides feature water tube systems. These tubes can be taken to the sink to be filled or drained and give more flexibility for moving the bed. Inner support rails are fabric covered and made from Soy based foam and engineered to give a comfortable sitting and sleeping edge. Shallow fill is achieved by addition of a foam pad inside the rails. This pad can be placed either on top of or below the tubes to achieve the desired feel. Luxurious Pure Cotton non-quilted stretch mattress cover allows no toxic flame retardant chemicals required. Strobel Softsides are part of their Winners Collection and each is named after horses that are Winners of the Kentucky Derby. When you choose a Strobel Softside Waterbed you too will be a Winner! Many people rave about the health benefits and how well they sleep on Strobel Waterbeds. their bodies are over 90% water. Strobel waterbeds achieve nearly 0-Gravity. This results in less pressure on your body and better sleep. Complete systems also include upholstered heavy duty waterbed foundation base, and 9-Leg Heavy Duty metal bed frame designed for waterbeds. Strobel Mattress Size: Queen